Why is Matrix3DHomogeneous internal

[MartinZikmund]

I am trying to understand how to utilize the functionality within classes like Matrix3DHomogeneous. I would like to calculate a 4x4 transformation matrix with rotation, translation, etc. but the related classes seem to be internal and nothing seems to be using them. Is that the case?

[JohanLarsson]

I don't remember, maybe it is WIP? Branch would perhaps have been better if so.